9.4.1

Likely highlights

Rich error messages (@adinapoli)
Multiple home packages (@fendor, @wz1000?)
Many bugs fixed in recompilation checking and the driver (@mpickering)
Native Haskell stack unwinding (@supersven)
Reinstallable GHC (@wz1000)
hi Haddock (@wz1000)
Tag inference (@AndreasK)
Strict typeclass dictionaries by default (@AndreasK)
Eliminate eventlog way (@bgamari)
Improved static linking support (@adamse)
Improved compilation parallelism (@mpickering, @dfordivam)
Core-to-core optimisation improvements: boxity analysis, nested CPR (@sgraf812)
Improved C++ linking support (@Phyx, @bgamari)
Revamped Windows support (@bgamari)
~~Improvements in compiler-performance for coercion-heavy programs (@adamgundry, @sheaf)~~
Numerous other compiler performance improvements (@bgamari, @mpickering, @doyougnu, @hsyl20)
Significant improvements to maximum memory usage with --make mode (up to 50% better) (@mpickering)
Better code generation for non-allocating case alternatives (@nineonine, #16064)
Part 1 of the migration from GHCi tag generation (@emiflake !6325 (closed))